And a test

Author: sterliakov

test-data/unit/check-typevar-tuple.test

@@ -2675,9 +2675,21 @@ class A(tuple[Unpack[tuple[int]]]): ...
 class B(tuple[Unpack[tuple[()]]]): ...
 
 a: A
-tuple(a)
+reveal_type(tuple(a))  # N: Revealed type is "builtins.tuple[builtins.int, ...]"
 (x,) = a
 
 b: B
 (_,) = b  # E: Need more than 0 values to unpack (1 expected)
 [builtins fixtures/tuple.pyi]
+
+[case testNoCrashSubclassingTupleWithVariadicUnpack]
+# https://github.com/python/mypy/issues/19105
+from typing import Unpack
+
+class A(tuple[Unpack[tuple[int, ...]]]): ...
+
+a: A
+tuple(a)
+(x,) = a
+(_,) = a
+[builtins fixtures/tuple.pyi]